The exact Erdős-Ko-Rado Theorem for 3-wise $t$-intersecting uniform families

One of the central problems in extremal set theory is the determination of the maximum size of an $r$-wise $t$-intersecting $k$-graph on $n$ vertices. For $r=2$ after decades of effort, a complete solution was given by the Complete Intersection Theorem (\cite{AK0}). However the case $r\geq 3$ remain